Getting the horsepower, flow rate, and head rating right matters more than brand loyalty. Here's how to match a pump to your well before you buy.
Horsepower determines how much power the motor has, but it's not the number to size around directly — it's a function of the other two. Flow rate (GPM) is how much water the pump delivers, and needs to match or exceed your household's peak simultaneous demand. Total dynamic head is the total resistance the pump has to overcome — well depth, elevation gain to the house, plus friction loss in the piping — and determines how much pressure the pump can maintain at your required flow rate.
Don't just match your old pump's horsepower. If your well's water level has changed, if you've added fixtures, or if your old pump was undersized to begin with, replacing like-for-like just repeats the same problem. Check actual well yield and household demand before buying.
33 GPM, 190 ft max head, stainless steel construction, 33 ft cable included — suitable for 4" wells, solid value option for straightforward replacements.
Check Price on Amazon →20 GPM, 270 ft shut-off head, 2-wire design (no control box needed), stainless steel construction, 5-year warranty — the premium option for deeper wells and long-term reliability.
Check Price on Amazon →2-wire pumps have starting components built into the motor and don't need a separate control box — simpler installation, fewer above-ground parts to fail, but harder to service if something inside the motor does fail. 3-wire pumps use an external control box, which is easier and cheaper to service when something goes wrong, at the cost of one more component that can fail.